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Gas Discharge Tubes
© 2017 Littelfuse, Inc.Specifications are subject to change without notice.
Revised: 12/12/17
SL1021A/B Series
Description
GDT circuit protection devices dissipate electrical surge energy safely within a contained plasma gas. Commonly used to help protect sensitive telecom and networking equipment and lines, GDTs protect from damage that may result from lightning strikes and equipment switching operations.The Littelfuse GDT series described in this document are available in a variety of leaded and surface mount forms and offered with and without optional fail-safe clip. Please refer to the electrical specifications, dimension and packaging options section of this document for additional information.SL1021A/B Series:
SL1021A/B series GDTs are designed to offer high levels of performance on fast rising transients in the range of 100V/μS to 1KV/μS, which are those most likely created by induced lightning disturbances.These devices feature ultra low capacitance (typically 1.5pF or less) and are extremely robust with SL1021A devices able to divert a 10,000 Amp pulse without destruction, and SL1021B suffix devices able to divert a 20,000 Amp pulse without destruction. These series offer optimized internal geometry which provide low insertion loss at high frequencies, ideal for the protection of broadband and other high speed transmission equipment.
Features
• RoHS compliant• Low insertion loss• Excellent response to
fast rising transients• Ultra low capacitance
• 10KA (A suffix devices) / 20KA (B suffix devices) surge capability tested with 8/20μs pulse as defined by IEC 61000-4-5
• Available with thermal failsafe option (add ‘F’ suffix to part number)
Applications
SL1021:• Broadband equipment• ADSL equipment• XDSL equipment • Satellite and CATV
equipment • Splitters• General telecom
equipment
• Telecom network interfaces
• Telephone line cards• Repeaters• Modems• Line test equipment
AGENCY AGENCY FILE NUMBER
E128662
Agency Approvals
3 Electrode GDT Graphical Symbol
a
e
b a = TIPb = RINGe = GROUND(center electrode)
Product Characteristics
Materials Dull Tin Plate 17.5 ± 12.5 Microns. with ceramic insulator
Product Marking‘LF’ mark, voltage& date code:SL1021A - Red/White textSL1021B - Blue/White text
Glow to arctransition current ~ 1Amp
Glow Voltage ~60-200 Volts
Storage and Operation Temperature -40 to +90°C
Transverse Voltage (Delay Time) < 0.2µSec (Tested to ITU-T Rec. K.12)
Arc Voltage ~10 to 35 Volts
Holdover Voltage <150mS (Tested to ITU-T Rec. K.12)
SL1021A/B Series RoHS
Gas Discharge Tubes
© 2017 Littelfuse, Inc.Specifications are subject to change without notice. Revised: 12/12/17
SL1021A/B Series
Electrical Characteristics
Device Specifications (at 25°C) Life Ratings
Part Number
DC Voltage100V/Sec.
DC Voltage 100 V/μSec.
DC Voltage
1kV/μSec.
Capaci-tance
(@1Mhz)
Insulation Resistance
AC Current50Hz
1Sec.x101
Surge Current
8/20μSecx101
Max Single Surge
8/20μSec1
Max Single Surge
10/350μSec1
Surge Life10/1000
μSecx3001MIN TYP MAX MIN
SL1021B075 60 75 90
500
650
<1.5pF
>1010 Ω(at 50V)
10Amps 10kA2
20kA315kA2
25kA3
4kA2
5kA3
200Amps
SL1021A090SL1021B090 72 90 108
SL1021A145SL1021B145 116 145 174
600
>1010 Ω(at 100V)
2.5kA2
5kA3
SL1021A150SL1021B150 120 150 180
SL1021A200 150 200 250
SL1021A230SL1021B230 184 230 276 450
650SL1021A250SL1021B250 200 250 300 500
SL1021A260SL1021B260 210 260 310 550 700
SL1021A300SL1021B300 240 300 360 650 850
SL1021A350SL1021B350 280 350 420 700 900
SL1021A400SL1021B400 320 400 480
850 950SL1021A420SL1021B420 345 420 500
SL1021A450SL1021B450 360 450 540 900 1000
SL1021A500SL1021B500 400 500 600 950 1100
SL1021A600 480 600 720 1000 1200
NOTES:1. Total current through centre electrode, tested in accordance with ITU-T Rec K.122. SL1021A series3. SL1021B series
Additional Information
Datasheet SamplesResources
Datasheet SamplesResourcesSL1021BSL1021B SL1021B
SL1021ASL1021A SL1021ASamples
SamplesSL1021B
SL1021A
Gas Discharge Tubes
© 2017 Littelfuse, Inc.Specifications are subject to change without notice.
Revised: 12/12/17
SL1021A/B Series
Time vs. Current for Failsafe
0.5
123456789
1112131415
10
20
30
60
1 2 5 10 15 30
SL102xA with FailsafeSL102xB or PMT8 500 Volt Higher Melting Point Solder
SL102xB or PMT8 90 Volt Higher Melting Point SolderSL102xB or PMT8 350 Volt Higher Melting Point Solder
Voltage vs. Time Characteristic
Vo
ltag
e(V
)
Time (ns)
0 200 400 600 800 1000 1200
Max dynamic breakovervoltage
Hold-over voltage
On-State voltage
Reflow Condition Pb – Free assembly
Pre Heat
- Temperature Min (Ts(min)) 150°C
- Temperature Max (Ts(max)) 200°C
- Time (Min to Max) (ts) 60 – 180 secs
Average ramp up rate (Liquidus Temp (TL) to peak
3°C/second max
TS(max) to TL - Ramp-up Rate 5°C/second max
Reflow- Temperature (TL) (Liquidus) 217°C
- Temperature (tL) 60 – 150 seconds
Peak Temperature (TP) 260+0/-5 °C
Time within 5°C of actual peak Temperature (tp)
10 – 30 seconds
Ramp-down Rate 6°C/second max
Time 25°C to peak Temperature (TP) 8 minutes Max.
Do not exceed 260°C
Soldering Parameters - Reflow Soldering (Surface Mount Devices)
Time
Tem
pera
ture
TP
TLTS(max)
TS(min)
25
tP
tL
tS
time to peak temperature(t 25ºC to peak)
Ramp-down
Ramp-up
Preheat
Critical ZoneTL to TP
Soldering Parameters - Wave Soldering (Thru-Hole Devices)
Soldering Parameters - Hand Soldering
Dwell Time
0
20
40
60
80
100
120
140
160
180
200
220
240
260
280
300
0 10 20 30 40 50 60 70 80 90 100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
Time (Seconds)
Tem
pera
ture
(°C
) - M
easu
red
on b
otto
m s
ide
of b
oard
Cooling TimePreheat Time
Wave Parameter Lead-Free Recommendation
Preheat:(Depends on Flux Activation Temperature) (Typical Industry Recommendation)
Temperature Minimum: 100° C Temperature Maximum: 150° C Preheat Time: 60-180 seconds
Solder Pot Temperature: 280° C Maximum
Solder Dwell Time: 2-5 seconds
Recommended Process Parameters:
Solder Iron Temperature: 350° C +/- 5°C Heating Time: 5 seconds max.
Note: Surge Arrestors with a Failsafe mechanism should be individually examined after soldering
Gas Discharge Tubes
© 2017 Littelfuse, Inc.Specifications are subject to change without notice. Revised: 12/12/17
SL1021A/B Series
8.1[0.319]
10.10[0.398]
9.9[0.354]9.9
[0.354]
10.10[0.398]
4.4± 0.3[0.173± 0.12]
4.4± 0.3[0.173± 0.12]
15[0.590]
16.8[0.661]
4.4[0.173]
1.0 DIA.[0.039]
12.4 ± 1[0.488 ± 0.039]
11.8[0.464]
11.8[0.464]
8.1.[0.319]
9.9[0.354]
16.8[0.661]
11.8[0.464]
6.35 ± 0.5[0.25 ± 0.25]
15[0.590]
1.0 DIA.[0.039]
8.1 DIA. MAX.[0.319]
10.10[0.398]
14.7 [0.579]
6.35 ± 0.5[0.25 ± 0.25]
9.0[0.354]
0.3mmMinimum
Gap0.3mmMinimum
Gap
0.3mmMinimum
Gap
Mounting Area
9.0[0.354]
Mounting Area
9.0[0.354]
Mounting Area
9.9[0.354]
10.10[0.398]
5.5± 0.3[0.216± 0.12]
5.5± 0.3[0.216± 0.12]
15[0.590]
16.8[0.661]
4.4[0.173]
1.0 DIA.[0.039]
12.4 ± 1[0.488 ± 0.039]
11.8[0.464]
8.1.[0.319]
0.3mmMinimum
Gap
9.0[0.354]
Mounting Area
10.10[0.398]
22[0.866]
1.0 DIA..[0.039]
50 ± 3[1.968 ± 0.118 ]
8.1 DIA. MAX.[0.319]
11.8[0.464]
23.8[0.937]
9.0[0.354]
Mounting Area
0.3mmMinimum
Gap
Type 01 / C
Type 60
Type 06 / Y Type 14 / X
Type 04 / R
Type 05 / P
PROFILE VIEW
SOLDERING PAD LAYOUT
SIDE VIEW TOP VIEW
7.7 ± 0.3[0.303 ± 0.019]
10.0 ± 0.3[0.394 ± 0.019]
Ø7.0 ± 0.1[0.275 ± 0.004]
8.3 +0.3/-0.0[0.327
+0.019/-0.00]
8.0 +0.3/-0.1[0.315
+0.019/-0.004]
8.5 ± 0.0[0.335 ± 0.000]
2.2 ± 0.0[0.087 ± 0.000]
6.0 ± 0.0[0.236 ± 0.000]
10.75 ± 0.0[0.423 ± 0.000]
1.2 ± 0.0[0.047 ± 0.000]1.2 ± 0.0
[0.047 ± 0.000]
Overall Product SpaceDO NOT ENCROACH
Device Dimensions
NOTE: Failsafe option dimensions shown in green.
Shaped Radial Leaded Devices: Core Devices:
Straight Radial Leaded Devices:
Straight "T" Leaded Devices:
8.1[0.319]
10.10[0.398]
9.9[0.354]9.9
[0.354]
10.10[0.398]
4.4± 0.3[0.173± 0.12]
4.4± 0.3[0.173± 0.12]
15[0.590]
16.8[0.661]
4.4[0.173]
1.0 DIA.[0.039]
12.4 ± 1[0.488 ± 0.039]
11.8[0.464]
11.8[0.464]
8.1.[0.319]
9.9[0.354]
16.8[0.661]
11.8[0.464]
6.35 ± 0.5[0.25 ± 0.25]
15[0.590]
1.0 DIA.[0.039]
8.1 DIA. MAX.[0.319]
10.10[0.398]
14.7 [0.579]
6.35 ± 0.5[0.25 ± 0.25]
9.0[0.354]
0.3mmMinimum
Gap0.3mmMinimum
Gap
0.3mmMinimum
Gap
Mounting Area
9.0[0.354]
Mounting Area
9.0[0.354]
Mounting Area
9.9[0.354]
10.10[0.398]
5.5± 0.3[0.216± 0.12]
5.5± 0.3[0.216± 0.12]
15[0.590]
16.8[0.661]
4.4[0.173]
1.0 DIA.[0.039]
12.4 ± 1[0.488 ± 0.039]
11.8[0.464]
8.1.[0.319]
0.3mmMinimum
Gap
9.0[0.354]
Mounting Area
10.10[0.398]
22[0.866]
1.0 DIA..[0.039]
50 ± 3[1.968 ± 0.118 ]
8.1 DIA. MAX.[0.319]
11.8[0.464]
23.8[0.937]
9.0[0.354]
Mounting Area
0.3mmMinimum
Gap
Type 01 / C
Type 60
Type 06 / Y Type 14 / X
Type 04 / R
Type 05 / P
PROFILE VIEW
SOLDERING PAD LAYOUT
SIDE VIEW TOP VIEW
7.7 ± 0.3[0.303 ± 0.019]
10.0 ± 0.3[0.394 ± 0.019]
Ø7.0 ± 0.1[0.275 ± 0.004]
8.3 +0.3/-0.0[0.327
+0.019/-0.00]
8.0 +0.3/-0.1[0.315
+0.019/-0.004]
8.5 ± 0.0[0.335 ± 0.000]
2.2 ± 0.0[0.087 ± 0.000]
6.0 ± 0.0[0.236 ± 0.000]
10.75 ± 0.0[0.423 ± 0.000]
1.2 ± 0.0[0.047 ± 0.000]1.2 ± 0.0
[0.047 ± 0.000]
Overall Product SpaceDO NOT ENCROACH
8.1[0.319]
10.10[0.398]
9.9[0.354]9.9
[0.354]
10.10[0.398]
4.4± 0.3[0.173± 0.12]
4.4± 0.3[0.173± 0.12]
15[0.590]
16.8[0.661]
4.4[0.173]
1.0 DIA.[0.039]
12.4 ± 1[0.488 ± 0.039]
11.8[0.464]
11.8[0.464]
8.1.[0.319]
9.9[0.354]
16.8[0.661]
11.8[0.464]
6.35 ± 0.5[0.25 ± 0.25]
15[0.590]
1.0 DIA.[0.039]
8.1 DIA. MAX.[0.319]
10.10[0.398]
14.7 [0.579]
6.35 ± 0.5[0.25 ± 0.25]
9.0[0.354]
0.3mmMinimum
Gap0.3mmMinimum
Gap
0.3mmMinimum
Gap
Mounting Area
9.0[0.354]
Mounting Area
9.0[0.354]
Mounting Area
9.9[0.354]
10.10[0.398]
5.5± 0.3[0.216± 0.12]
5.5± 0.3[0.216± 0.12]
15[0.590]
16.8[0.661]
4.4[0.173]
1.0 DIA.[0.039]
12.4 ± 1[0.488 ± 0.039]
11.8[0.464]
8.1.[0.319]
0.3mmMinimum
Gap
9.0[0.354]
Mounting Area
10.10[0.398]
22[0.866]
1.0 DIA..[0.039]
50 ± 3[1.968 ± 0.118 ]
8.1 DIA. MAX.[0.319]
11.8[0.464]
23.8[0.937]
9.0[0.354]
Mounting Area
0.3mmMinimum
Gap
Type 01 / C
Type 60
Type 06 / Y Type 14 / X
Type 04 / R
Type 05 / P
PROFILE VIEW
SOLDERING PAD LAYOUT
SIDE VIEW TOP VIEW
7.7 ± 0.3[0.303 ± 0.019]
10.0 ± 0.3[0.394 ± 0.019]
Ø7.0 ± 0.1[0.275 ± 0.004]
8.3 +0.3/-0.0[0.327
+0.019/-0.00]
8.0 +0.3/-0.1[0.315
+0.019/-0.004]
8.5 ± 0.0[0.335 ± 0.000]
2.2 ± 0.0[0.087 ± 0.000]
6.0 ± 0.0[0.236 ± 0.000]
10.75 ± 0.0[0.423 ± 0.000]
1.2 ± 0.0[0.047 ± 0.000]1.2 ± 0.0
[0.047 ± 0.000]
Overall Product SpaceDO NOT ENCROACH
8.1[0.319]
10.10[0.398]
9.9[0.354]9.9
[0.354]
10.10[0.398]
4.4± 0.3[0.173± 0.12]
4.4± 0.3[0.173± 0.12]
15[0.590]
16.8[0.661]
4.4[0.173]
1.0 DIA.[0.039]
12.4 ± 1[0.488 ± 0.039]
11.8[0.464]
11.8[0.464]
8.1.[0.319]
9.9[0.354]
16.8[0.661]
11.8[0.464]
6.35 ± 0.5[0.25 ± 0.25]
15[0.590]
1.0 DIA.[0.039]
8.1 DIA. MAX.[0.319]
10.10[0.398]
14.7 [0.579]
6.35 ± 0.5[0.25 ± 0.25]
9.0[0.354]
0.3mmMinimum
Gap0.3mmMinimum
Gap
0.3mmMinimum
Gap
Mounting Area
9.0[0.354]
Mounting Area
9.0[0.354]
Mounting Area
9.9[0.354]
10.10[0.398]
5.5± 0.3[0.216± 0.12]
5.5± 0.3[0.216± 0.12]
15[0.590]
16.8[0.661]
4.4[0.173]
1.0 DIA.[0.039]
12.4 ± 1[0.488 ± 0.039]
11.8[0.464]
8.1.[0.319]
0.3mmMinimum
Gap
9.0[0.354]
Mounting Area
10.10[0.398]
22[0.866]
1.0 DIA..[0.039]
50 ± 3[1.968 ± 0.118 ]
8.1 DIA. MAX.[0.319]
11.8[0.464]
23.8[0.937]
9.0[0.354]
Mounting Area
0.3mmMinimum
Gap
Type 01 / C
Type 60
Type 06 / Y Type 14 / X
Type 04 / R
Type 05 / P
PROFILE VIEW
SOLDERING PAD LAYOUT
SIDE VIEW TOP VIEW
7.7 ± 0.3[0.303 ± 0.019]
10.0 ± 0.3[0.394 ± 0.019]
Ø7.0 ± 0.1[0.275 ± 0.004]
8.3 +0.3/-0.0[0.327
+0.019/-0.00]
8.0 +0.3/-0.1[0.315
+0.019/-0.004]
8.5 ± 0.0[0.335 ± 0.000]
2.2 ± 0.0[0.087 ± 0.000]
6.0 ± 0.0[0.236 ± 0.000]
10.75 ± 0.0[0.423 ± 0.000]
1.2 ± 0.0[0.047 ± 0.000]1.2 ± 0.0
[0.047 ± 0.000]
Overall Product SpaceDO NOT ENCROACH
Type “R” is available for SL1021B075 device only.
Gas Discharge Tubes
© 2017 Littelfuse, Inc.Specifications are subject to change without notice.
Revised: 12/12/17
SL1021A/B Series
PackagingPart Numbering System and Ordering Information
PMT8 xxx x x
Breakdown Voltage090 = 90V230 = 230V250 = 250V350 = 350V400 = 400V
Breakdown Voltage090 = 90V145 = 145V150 = 150V200 = 200V230 = 230V250 = 250V260 = 260V
300 = 300V350 = 350V400 = 400V420 = 420V450 = 450V500 = 500V600 = 600V
SeriesPMT8
Configuration Code
Option CodeBlank = No FailsafeF = With Failsafe
SL102x x xxx x x
SeriesSL1021SL1024
Surge CapabilityA = 10kAB = 20kA
Configuration Code(See Device Dimensions section) (See Device Dimensions section)
C RP
01040506
YX
101460
Blank = No failsafeF or G = With Failsafe
Option Code
Device Type Description Quantity
Type C 100pcs/tray x 5 trays per carton 500
Type R 100pcs/tray x 5 trays per carton 500
Type P 100pcs/tray x 5 trays per carton 500
Type Y 100pcs/tray x 5 trays per carton 500
Type X 50pcs/tray x 5 trays per carton 250
* Please contact the factory for further packaging information.
For 'SL1021A/B' device type C, R, P, Y packing
Box (Cardboard)
Tray (PET)for 50 Pcs.
Sponge (PE Form)
~58
~135
~258
Box (Cardboard)
Tray, Cover (PET)
Tray, Bottom (PET)for 100 Pcs.
PE Form
~55
~235
For 'SL1021A/B' device type X packing
Box (Cardboard)
Tray (PET)for 50 Pcs.
Sponge (PE Form)
~58
~135
~258
Box (Cardboard)
Tray, Cover (PET)
Tray, Bottom (PET)for 100 Pcs.
PE Form
~55
~235
Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at: www.littelfuse.com/disclaimer-electronics.
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information: Littelfuse:
SL1021A450RG SL1021A090RG SL1021B600RF SL1021B600RS SL1021B600RG SL1021A145RG
SL1021A200RG SL1021B300RG SL1021A500RG SL1021B420RG SL1021A150RG SL1021B250RG
SL1021B260RG SL1021A300RG SL1021B400RG SL1021A600RG SL1021A350RG SL1021B500RG
SL1021B200RG SL1021B600C SL1021B600R SL1021A420RG SL1021B145RG SL1021A400RG SL1021B090RG
SL1021B450RG SL1021B150RG SL1021A230RG SL1021A260RG SL1021B350RG SL1021A250RG
SL1021B150C SL1021B250RF SL1021B300R SL1021A260C SL1021B500R SL1021B350T SL1021B200C
SL1021A260R SL1021A090T SL1021B350RF SL1021A400C SL1021B500RF SL1021A230R SL1021A400RF
SL1021B090RS SL1021B300RF SL1021B300RS SL1021B400C SL1021N230RF SL1021A300RF SL1021A600C
SL1021A600RF SL1021A145R SL1021A260RS SL1021A250RS SL1021B230R SL1021A500CF SL1021B145RS
SL1021A450R SL1021A150C SL1021A090RS SL1021A350RS SL1021B420RS SL1021B260T SL1021A200RS
SL1021A450RS SL1021A500T SL1021B145RF SL1021B200T SL1021B400RS SL1021A090C SL1021A300C
SL1021A400R SL1021B230CF SL1021A500C SL1021A500RF SL1021B145R SL1021B090RF SL1021B200RF
SL1021A600RS SL1021B260C SL1021A230RS SL1021A300R SL1021A500R SL1021A200T SL1021B420RF
SL1021A200C SL1021A260T SL1021A200RF SL1021A230RF SL1021B200R SL1021B350RS SL1021B350C
SL1021A350RF SL1021A145RS SL1021A230C SL1021A450C SL1021A145RF SL1021A350R
